IMPORTANT DEFINITIONS OF FRACTIONS

1. Fraction
Vocabulary

2. Fraction – A way of
representing part of a
whole or part of a group.
Numerator – The number on top
that tells how many equal parts
are described in the fraction.
Denominator – The quantity below
the line in a fraction. It tells
the number of equal parts into
which the whole is divided.

3. Equivalent Fractions
Fractions that name the same
number or amount.
3 6
4 8
Simplest Form
A fraction that has 1 as the greatest common factor of the
numerator and denominator. The numerator and denominator
are as low as they can go.

4. Greatest Common Factor
•Also known as GCF
•The largest number that
divides evenly into two or more
numbers.
•Used when simplifying
fractions

5. Least Common Denominator
The least common multiple of the
denominators of two or more
fractions.
Ex: 4/8 and 5/6
Multiples of 8: 8, 16, 24, 32, 40, 48, 56
Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48
The Least Common Denominator would be 24.

6. Mixed Number
Number that contains a whole number
and a fraction.
Ex: 3 ½
Improper Fraction
Fraction in which the numerator
is bigger than the denominator.
You must DIVIDE to make it
into a mixed number. EX: 25
4

7. Mixed Number
Number that contains a whole number
and a fraction.
Ex: 3 ½
Improper Fraction
Fraction in which the numerator
is bigger than the denominator.
You must DIVIDE to make it
into a mixed number. EX: 25
4